Good to see that XP SP2 is getting some good advertising.
I have it on all my machines at home (I have since RC1) but not on my sole XP machine at work. I'm a member of our internal control group so I'm one of the few 'softies not running SP2. I do most of my coding on Win 2003 machines so I can easily allow multiple QA people to test out my changes to VS without checking them into the depot and waiting for a daily drop. I made sure to turn on themes though so it's pretty. (Go to My Computer->Manage->Services and turn on the Themes service and they'll be available in the Display properties).